sigma and pi bonds are two types of covalent bond. They differ each other on the mode of overlapping of atomic orbitals - head to head overlapping or side wise overlapping. First kind of overlapping gives sigma bond while second kind of overlapping gives pi bond.
Electron density concentrates between two nuclei. It can shield internuclear repulsion effectively. Then there is greater extent of overlapping of atomic orbitals. That makes sigma bond stronger.
Where as electron concentrates above and below the internuclear axis. So, it can not shield internuclear repulsion effectively. As a result there is lesser extent of overlapping on pi bond which makes pi bond weaker than sigma bond
Click here to watch video of sigma bond and pi bond.
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